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Top 1000 câu hỏi thường gặp môn Tiếng Anh có đáp án (phần 120)
Câu 12: During droughts water is scarce but is it possible to make it rain to provide water. Experiments in cloud seeding suggest that it may be possible to artificially create rainfall.
Rainfall occurs when supercooled droplets of water – those that are still liquid but are at a temperature below the usual freezing point of zero centigrade – form ice crystals. Now too heavy to remain suspended in the air, these then fall, often melting on their way down to form rain.
Even in dry areas the air usually contains some water. This can be made to come together and form ice crystals by seeding the atmosphere with chemicals such as silver iodide or dry ice. They work to promote rainfall by inducing nucleation – what little water is in the air condenses around the newly introduced particles and crystallises to form ice. The ‘seeds’ can be delivered by plane or simply by spraying from the ground.
But does it work? It’s hard to tell for sure. As is often the case with weather and climate, it’s impossible to carry out a controlled experiment – so, in areas of increased precipitation, we can’t know whether it would still have rained even if the clouds hadn’t been seeded.
Success has been claimed for trials in Australia, France, Spain and the US. In the United Arab Emirates, the technique is credited with the creation of 52 storms in the Abu Dhabi desert, while China boasts of having used the technology in reverse to keep the Beijing Olympic Games of 2008 dry. Recent research, however, suggests that it’s not as effective as was previously believed.
(Source: http://www.physics.org/)
Which best serves as the title for the passage?
A. How does cloud seeding work?
B. Cloud seeding does not deserve all the attention.
C. Technology interferes with nature.
D. Climate modification is a thing now.
Lời giải:
Đáp án A
Câu nào sau đây thích hợp nhất làm tiêu đề cho đoạn văn?
A. Công nghệ tạo mưa nhân tạo hoạt động như thế nào?
B. Công nghệ tạo mưa nhân tạo không đáng được chú ý rộng rãi.
C. Công nghệ can thiệp vào tự nhiên.
D. Biến đổi khí hậu là một điều đang diễn ra bây giờ.
Căn cứ vào thông tin đoạn đầu:
During droughts water is scarce but is it possible to make it rain to provide water. Experiments in cloud seeding suggest that it may be possible to artificially create rainfall.
(Trong thời gian hạn hán, nước rất khan hiếm nhưng có thể làm cho trời mưa để cung cấp nước. Các thí nghiệm tạo mưa nhân tạo cho thấy có thể tạo ra lượng mưa một cách nhân tạo.)
Như vậy, đoạn văn đang nói về cách hoạt động công nghệ tạo mưa nhân tạo.
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